winecoreaudio: GetNextPacketSize returns 0 when no data is available yet. (try 2)

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

With these 2 patches, most of my capture tests pass, except:

- period size 4096 -- actually varying, sometimes 4102 or 4103...
- GetBufferSize never reached if not multiple of period size;
  Here I think I'll make winecoreaudio round like native in
  exclusive mode, where duration becomes a multiple, to avoid
  this issue.  Requires knowing the actual period...
- Reset kills recording.

I ran my capture tests in a loop and output was stable over
hundreds of iterations.  Quite to the contrary, the render tests
currently cause a random deadlock that appears to involve EVENTCALLBACK
or exclusive mode, perhaps when a callback event is set.
That must be nailed down and eliminated for 1.4!

Regards,
	Jörg Höhle
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